WHEATON, Ill. — A suburban Chicago woman stabbed her 7-year-old son 100 times then turned the knife on a 5-year-old girl who witnessed the killing, as both children begged for their lives, a prosecutor said yesterday.

Elzbieta Plackowska, 40, told investigators she stabbed the children and slashed their throats on Tuesday night at the home in Naperville, Ill., because she was angry with her husband, a truck driver who was often away, DuPage County State’s Attorney Robert Berlin said.

Plackowska told investigators her husband left her alone to care for her son, Justin, and work as a maid, which she felt was beneath her, Berlin said at a hearing.

“She told the detectives that she thought by killing Justin, she would make her husband hurt the way she hurt in their relationship,” Berlin said.

Plackowska told investigators she found Justin and Olivia Dworakowski — whom she was baby-sitting that night — jumping on the bed, Berlin said.

“She had grabbed the knife, and she made both victims kneel and begin praying,” Berlin said.

“She began stabbing her son, Justin, and told him he was going to heaven tonight.”